Has anyone run into an issue where, with fade up from or to black on a background layer in an animation tiimeline the scrubber stops at the fade and pops up an unexplained "program error." Seems only to be on the background layer. No issue with a straight fade. (When it's a fade up, the scrubber won't even start and throws off the error. When it's a fade down, scrubber gets to fade and stops.)
OS Mojave 10.14.6, PS 21.0.0