I don't know of the explanation for this, but there is a quirky workaround, at least here.
We have an app that uses a flow to submit an image to a library, but the gallery wasn't refreshing afterwards.
So, we added a timer to trigger following that upload.
The timer waits a couple seconds and then patches the record of a dummy file in the library (updating, in this case, merely the description; it doesn't matter what you change). This file is not part of the gallery; it's used only for this workaround, but it is in the same library as is used for the gallery.
And that's it, the gallery refreshes at that point.
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Features releasing from October 2020 through March 2021