Remove Attributes from stills causes issues

In the Edit page, I have a still PNG with transform keyframes.
Right click/Remove attribues/ALL ATTRIBUTES
This causes the PNG to remove all attributes, but also brings it down to a single frame duration, which is not extendable in either direction.
Solution was to find original media and replace.
Right click/Remove attribues/ALL ATTRIBUTES
This causes the PNG to remove all attributes, but also brings it down to a single frame duration, which is not extendable in either direction.
Solution was to find original media and replace.