@apps I assume you are testing with this exact commit? https://codeberg.org/tom79/Fedilab/commit/db17df93f0bd3851941d948a8b6dbfed28d57481
If you wanted web+activitypub: to work (without the //) you can’t have host and pathPattern in there. Only <data android:scheme="web+activitypub" /> analogous to the gist I linked earlier.
However see my comments on the Tusky issue tracker on why I believe fedilinks is better than FEP-07d7: https://github.com/tuskyapp/Tusky/issues/5027#issuecomment-2764451529
fedilinks uses :// anyway