Observed behaviour:

In 21w44a

As shown in picture1 i buld a portal chunkloader(a contraption that loads chunks without player by passing entity through nether portal from overworld to nether and back), glass squares are aligned to chunk grid

Then i built redstone processing detectors and entity processing detectors in chunks A and B

While I as a player load both chunks, they are both detected as entity and redsone processing

But if I teleport away, that area is loaded only by portal loader, as shown in picture2 chunk A is detected as both entity and redsone processing and chunk B is detected as neither entity nor redstone processing

Expected behaviour:

Chunk B should process redstone but not entities as it does in 1.16 and 1.17