I've seen this before, see https://github.com/snarfed/bridgy-fed/issues/440 and the linked https://github.com/aaronpk/webmention.io/issues/187
by 
Jamie Tanna
.
Replies from 20 June 2023
Back to /kind/replies/, 2023, June 2023.
Back to /kind/replies/, 2023, June 2023.
I've seen this before, see https://github.com/snarfed/bridgy-fed/issues/440 and the linked https://github.com/aaronpk/webmention.io/issues/187
by Jamie Tanna
.