When Cauldrons are filled with lava from dripstone it happens instantly and not by layers.

I can reproduce this issue with lava, but not with water. If you can reproduce this with water, then could you please attach a video showcasing it?

Just a reminder, to make your bug report as effective as possible, please try and include the following steps to reproduce the problem:

Steps to Reproduce:
1.
2.
3.

Observed Results:
(Briefly describe what happens)

Expected Results:
(Briefly describe what should happen)

Nothing reproduce in water, It could causes of fast tick speed 1 the lava dripping into caldron fast

To reproduce

1. Set tick speed 1 in settings 

2. Create a Dripstone setup with top of glass and then place 3 caldrons

3. Add lava to left and add water to right

4. Place Dripstones in underneath of both glass

Observed result

The lava dripping into caldron way faster ticks with tick speed set 1

Expected behavior

Lava dripping to caldron should be able to match normal tick speed by default

World file included:

Thank you for your report!
However, this issue has been closed as Working as Intended.

If you need help or have a suggestion you might like to follow a link below.

Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki