Visual duplicates of effects when using items with Concentration that applies an effect first time each session

DnD5e 2.1.5, Foundry v10.291, Midi 10.0.33, dae 10.0.23 fvtt-midi-qol-settings.json

The game seems to choke when an item with Concentration and an effect is rolled for the first time each session and applies visual duplicates of sometimes both Concentration and whatever effect is supposed to be applied. No console errors.

While I did my testing with only Midi and dependencies, I asked in the MidiQoL thread in Foundry discord and thatlonelybugbear pointed out this also seems to be reproducible (if you have DFred's convenient effects enabled) if you add macro.CE to an effect, too. Maybe Concentration and the macro functions in effects have something in common that could cause the issue?

FWIW I discovered afterwards I can see it both in the standalone client and a separate browser logged in on a different account, if both accounts are logged in at the time of rolling, so it doesn't smack to me as entirely client side.