Real world example of transaction pinning affecting someone's Lightning node that was fixed earlier today by replace-by-fee-rate (via Libre Relay).
Full write-up: https://groups.google.com/g/bitcoindev/c/n2GNmnz0btw/m/IemUVKBoAgAJ
Discussion
Oh, actually here's another example from the same LN node, in the same F2Pool block: https://mempool.space/tx/ad21f74d694a0aeffdba2da50d9d18a4b636c100e2d4003f24cc36dcf9a9556c
...and we have _another_ example of this type of pinning from a totally different Lightning node: https://mempool.space/tx/4f6ed6c3fe25571b883a631503ab84cccef450b96d8c9065c712246758e15e6b