Villagers de-linking from established village

I have a village that appears to span more than 1 chunk.

I have had 2 instances where the villagers that are in this village will become de-registered with the village and will not recognize any beds or profession blocks, despite being very recently using those beds and profession blocks.

This appears to happen when 1 of the village chunks is loaded, but the other is not and me, the player is spending some frame of time / either a night or day transition when villagers would be either using beds or job blocks.

 

I was able to re-register the villagers only after either a) moving them 120ish blocks away and into a new village. or b) breaking all beds and job blocks and bells and reforming the previously existing village.