Anytime I try to edit a mod it disables itself and any other packs I have enabled. This happens on my phone, IPad, and Xbox one S.
In able to reproduce the same result, you need to download a mod that has an edit option. Enable the mod and attempt to edit the mod.
Thank you for your report!
We're tracking this issue at MCPE-230216, so this ticket is being resolved and linked as a duplicate.
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