I have not done any deep investigation but looking at the block example you shared and some other blocks with such transactions, I can say that this is the continuation of the same Ordinals Attack that started months ago, specially since as I warned months ago with the growing side-market that encourages this type of spam attack, it is not going to die anytime soon.

Here is an example transaction from the block you shared that clearly contains the Ordinals Junk which can be seen if you expand the scripts:
https://mempool.space/tx/688ef9666c8a9a0c40f318ff0f86b35c9575bd54d00893a189c2eba97bdc44d1
With the address that can be searched on the Ordinals Attack Explorer to see the actual junk:
https://ordiscan.com/address/bc1qnj580ysw0q7j5uvawh3mnqtjmyc9jrd8hnmek6

Compared to 4 months ago the scamfest market that feeds this attack has grown by 2800% in size (to $28 billion from the $10 million daily volume)!