Cross dissolve dips to black

Multicam, When I switch cameras, and add a cross dissolve, it seems the first clip dips to black almost, the next clip comes up from black.
sometimes it dissolves evenly

i have 15.0.0b.065
windows 10

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE fcpxml>
<fcpxml version="1.5">
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<format height="1080" name="FFVideoFormat1080p2997" id="r0" width="1920" frameDuration="1001/30000s"/>
<format height="0" name="FFVideoFormatRateUndefined" id="r1" width="0" frameDuration="1001/30000s"/>
<format height="2160" name="FFVideoFormat3840x2160p2997" id="r4" width="3840" frameDuration="1001/30000s"/>
<effect name="Cross Dissolve" id="r3" uid="FxPlug:4731E73A-8DAC-4113-9A30-AE85B1761265"/>
<media name="Multicam" id="r9">
<multicam tcStart="18018/5s" tcFormat="NDF" format="r0">
<mc-angle name="G85" angleID="1bcec599-c094-465f-bf55-0fb853b20939">
<gap duration="177177/625s" offset="0/1s" name="Gap" start="3600/1s"/>
<clip duration="7660653/1000s" offset="177177/625s" name="g85.MP4" start="0/1s" enabled="1" tcFormat="NDF" format="r4">
<adjust-transform scale="1 1" anchor="0 0" position="0 0"/>
<video duration="7660653/1000s" offset="0/1s" start="0/1s" ref="r5">
<audio duration="7660653/1000s" lane="-1" offset="0/1s" srcCh="1, 2" start="0/1s" ref="r5"/>
</video>
</clip>
</mc-angle>
<mc-angle name="YI 4k" angleID="73496917-f9fc-4d63-b4ab-c48cf91c1a22">
<gap duration="22833811/30000s" offset="0/1s" name="Gap" start="3600/1s"/>
<clip duration="3880877/2500s" offset="22833811/30000s" name="YDXJ0010-converted.mp4" start="15254239/15000s" enabled="1" tcFormat="NDF" format="r4">
<adjust-transform scale="1 1" anchor="0 0" position="0 0"/>
<video duration="38539501/15000s" offset="0/1s" start="0/1s" ref="r6">
<audio duration="38539501/15000s" lane="-1" offset="0/1s" srcCh="1, 2" start="0/1s" ref="r6"/>
</video>
</clip>
<gap duration="8899891/6000s" offset="35502467/6000s" name="Gap" start="3600/1s"/>
<clip duration="38559521/15000s" offset="8899891/6000s" name="YDXJ0011-converted.MP4" start="0/1s" enabled="1" tcFormat="NDF" format="r4">
<adjust-transform scale="1 1" anchor="0 0" position="0 0"/>
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<audio duration="38559521/15000s" lane="-1" offset="0/1s" srcCh="1, 2" start="0/1s" ref="r7"/>
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</clip>
</mc-angle>
<mc-angle name="GX85" angleID="cb96a6d2-7477-4275-8113-ab55ad6f764a">
<gap duration="759759/5000s" offset="0/1s" name="Gap" start="3600/1s"/>
<clip duration="15606591/2000s" offset="759759/5000s" name="gx85.MP4" start="0/1s" enabled="1" tcFormat="NDF" format="r4">
<adjust-transform scale="1 1" anchor="0 0" position="0 0"/>
<video duration="15606591/2000s" offset="0/1s" start="0/1s" ref="r8">
<audio duration="15606591/2000s" lane="-1" offset="0/1s" srcCh="1, 2" start="0/1s" ref="r8"/>
</video>
</clip>
</mc-angle>
</multicam>
</media>
<asset duration="79552473/10000s" hasVideo="1" audioSources="1" name="Multicam" start="18018/5s" hasAudio="1" id="r2" src="//localhost" format="r1" audioChannels="2"/>
<asset duration="7660653/1000s" hasVideo="1" audioSources="1" name="g85.MP4" start="0/1s" hasAudio="1" id="r5" src="file://localhost/F:/video%20capture/20180714%20Joseph%20and%20the%20Amazing%20Technicolor%20Dreamcoat/video/g85/g85.MP4" format="r4" audioChannels="2"/>
<asset duration="38539501/15000s" hasVideo="1" audioSources="1" name="YDXJ0010-converted.mp4" start="0/1s" hasAudio="1" id="r6" src="file://localhost/F:/video%20capture/20180714%20Joseph%20and%20the%20Amazing%20Technicolor%20Dreamcoat/video/yi%204k/YDXJ0010-converted.mp4" format="r4" audioChannels="2"/>
<asset duration="38559521/15000s" hasVideo="1" audioSources="1" name="YDXJ0011-converted.MP4" start="0/1s" hasAudio="1" id="r7" src="file://localhost/F:/video%20capture/20180714%20Joseph%20and%20the%20Amazing%20Technicolor%20Dreamcoat/video/yi%204k/YDXJ0011-converted.MP4" format="r4" audioChannels="2"/>
<asset duration="15606591/2000s" hasVideo="1" audioSources="1" name="gx85.MP4" start="0/1s" hasAudio="1" id="r8" src="file://localhost/F:/video%20capture/20180714%20Joseph%20and%20the%20Amazing%20Technicolor%20Dreamcoat/video/gx85/gx85.MP4" format="r4" audioChannels="2"/>
<asset duration="726618287/99900s" audioSources="1" name="soundboard.wav" start="0/1s" hasAudio="1" id="r10" src="file://localhost/F:/video%20capture/20180714%20Joseph%20and%20the%20Amazing%20Technicolor%20Dreamcoat/audio/tascam%20dr60/soundboard.wav" audioChannels="2"/>
<asset duration="726618287/99900s" audioSources="1" name="rhode.wav" start="0/1s" hasAudio="1" id="r11" src="file://localhost/F:/video%20capture/20180714%20Joseph%20and%20the%20Amazing%20Technicolor%20Dreamcoat/audio/tascam%20dr60/rhode.wav" audioChannels="2"/>
</resources>
<library>
<event name="Project (Resolve)">
<project name="Project (Resolve)">
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<spine>
<clip duration="151151/625s" offset="18018/5s" name="Multicam" start="65037973/15000s" enabled="1" tcFormat="NDF" format="r1">
<adjust-transform scale="1.12 1.12" anchor="0 0" rotation="0.67" position="0 0"/>
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<mc-clip duration="377377/1875s" lane="2" offset="65037973/15000s" name="Multicam" start="65037973/15000s" ref="r9">
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<audio duration="726618287/99900s" offset="0/1s" srcCh="1, 2" start="0/1s" ref="r11"/>
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</clip>
<transition duration="1001/1000s" offset="38449411/10000s" name="Transition">
<filter-video name="Transition" ref="r3"/>
</transition>
<clip duration="73073/15000s" offset="2403401/625s" name="Multicam" start="69542473/15000s" enabled="1" tcFormat="NDF" format="r1">
<adjust-transform scale="1.12 1.12" anchor="0 0" rotation="0.67" position="0 0"/>
<video duration="79552473/10000s" offset="18018/5s" start="18018/5s" ref="r2"/>
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<transition duration="1001/2000s" offset="19250231/5000s" name="Transition">
<filter-video name="Transition" ref="r3"/>
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<clip duration="69178109/10000s" offset="57754697/15000s" name="Multicam" start="11602591/2500s" enabled="1" tcFormat="NDF" format="r1">
<adjust-transform scale="1.12 1.12" anchor="0 0" rotation="0.67" position="0 0"/>
<video duration="79552473/10000s" offset="18018/5s" start="18018/5s" ref="r2"/>
</clip>
<gap duration="101101/2000s" offset="323043721/30000s" name="Gap" start="3600/1s"/>
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video of issue
https://www youtube.com/watch?v=Ct8ef1bb5Dw