Related to MC-133354, MC-134229 and MC-130890
Step to reproduce:
Step 1: Copy the setup (see below), you can make as high as you want
Step 2: Break the blue glass
Step 3: When the water flows down and touch the ground, quickly place the kelp, seagrass, coral, dead coral, coral fan, dead coral fan or conduit before the water spreads
Step 4: Done!
Note: You can place a block next to the kelp, seagrass, coral, dead coral, coral fan, dead coral fan or conduit to updates the water
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i can confirm this issue.
[media]
still an issue in 23w05a

The related reports listed in the descriptions still need linking, I was looking for this, but failed to find it due to overwhelming amount of reports involving waterlogging, if this was linked to MC-134229, I would've found it in seconds.

Can confirm in 24w45a

Confirmed in 1.21.4 prerelease 2