All relevant details I have at the moment (I'll add a log in the morning but my current one needs trimming) are posted on the other mod's tracker, in order to avoid redundancy.
SSKirillSS/relics#17

Hello,
The Wilden also reflects damage when their spikes are out. I presume the damage that the trinket applies isn't enough to actually kill it or you, so it just loops infinitely. Relic's will need to accommodate for these scenarios.

ah, ok. Yeah I figured it couldn't figure out who to apply the damage to. Presumably what Relics should do is break all three shields on the relic (one for each time that the damage bounced before exhausting the player's defense) and then apply the damage to the player. It sounds like the other dev is already on it, so I'll just leave the other issue open and hope for the best :-)