Hi,
I have the following scenario:
[RB2011] === [RB911] - - - - - - - - [RB911] === [RB850]
RB911 are in bridge + station-bridge mode (MTU = 1600) and a OSPF adjacency configured between RB2011 and RB850 (a /30 IPv4 prefix).
The OSPF adjacency was working perfectly till this evening in point-to-point mode (and was up since many days ago).
Suddenly, it went down and do not got in full state anymore.
I've tried to update all RouterOS to 6.44.6 version, but no success.
I've revised MTU, changed bridge MAC address on radios, changed /30 prefix, but no success.
The only way to make it work was using NBMA adjacency.
Is there a bug? Do I miss something in configuration? I didn't understand what happened 
Any suggestion?