While reading through the board, I discovered several posts stating that a LAG interface can be used as HA heartbeat and sync. Because I kind of like redundancy I went straight into merging my dedicated HA port (eth4) with the unused eth5, forming lag2 as a default 802.3ad LAG.
Both units are active and synced:

Port eth4 is the current sync interface for my failover setup:

Now I converted the HA interface in lag group #3 and a warning appears:

After clicking OK nothing happens yet, so I add eth5 to the LAG:

Now both units reboot automatically and after that I can't access neither one of them anymore. On both displays the following message appears:
HA DEACTIVATED
Node 0 ERROR
As there are some of you who apparently managed to use a LAG interface as HA sync, I'd really like to know what I'm doing wrong.
Cheers,
Manuel
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