I2P app can have 3 names

[licaon-kter]

From the Gradle files:

...
 productFlavors {
        free {
            applicationId 'net.i2p.android'
        }
        donate {
            applicationId 'net.i2p.android.donate'
        }
        legacy {
            applicationId 'net.i2p.android.router'
        }
...

So you need to check them all.

[licaon-kter]

Looks like F-Droid implemented a fix, rebuilding the app on the free branch.

But users need to uninstall I2P (legacy) and install the new I2P.

[str4d]

This was actually caused by a typo in an older release of the I2P Android client library. See https://github.com/anthonycr/Lightning-Browser/issues/395#issuecomment-262219066 for the actual fix.

[str4d]

(See https://trac.i2p2.de/ticket/1787 for the bug.)