What happens if a node successfully generates a new block but then goes offline or disconnected from the Blockchain?

Considering a miner has successfully generated a new block by solving the mathematical puzzle. What would happen if it goes offline or disconnected from other participating nodes in the Blockchain before it could broadcast the new block and sync with the other nodes in the Blockchain?

If I consider the case of a resync after the node is live again, how is that possible since blockchain is a growing list of blocks? Also I am assuming the block is invalid after successive blocks are created after it.

I came across a close enough question on SO but it appears to have some lack of clarity.

#blockchain