The bug
Because seagrass can now generate in the top block of water, and one block below, and can extend up one block through the water, village bridges only generate where there's water and no seagrass, so there are gaps where seagrass spawns.
How to reproduce
Seed: -205396693175326374
Coordinates: /execute in minecraft:overworld run tp @s -422.11 63.00 -450.79 -247.24 52.88
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I have also experienced this issue.

Finally found a village to reproduce this:
-6170973059443809196
/tp 820 62 -682
Affects 1.13-pre1

Can confirm for Pre release 2

Affects 1.13-pre3

Affects 1.13-pre6

Any seeds to reproduce this in 18w48a?
Cannot reproduce in 19w13b, based on the screenshot I took.
Can still reproduce in 21w05b.

I cannot reproduce in 21w16a with any of the given seeds.

Cannot reproduce in 1.17.
I have been able to find what appears to be the described behavior, but ultimately am unsure if the bridge generated first and the sea grass came after because the space was open, or if it was the other way around. Regardless, I will confirm this affects 1.21 Release Candidate 1.
Here is my example:
[media]
seed is 3147443740128566640
Can confirm.