When a sticky piston retracts, it doesn't update the blocks around the head if it's pulling a block since 1.13.1(3rd picture).(tested older version: 1.12.2, 1.13)

When there's no block or a block that can't be pulled in front it gives out updates as it should.(2nd picture)

Pictures:
1. setup
2. piston updating another piston
3. piston with block in front only updates other piston after fully retracted(updated by arriving block)
4. setup for 3. picture (the picture with the bug)

5. behaviour in 1.12.2

Expected: in both cases the 2nd piston immediately retracts

Edit: Can also be used with slime blocks that can't be pulled. e.g. floating water maker: https://www.youtube.com/watch?v=0JX70A2jfWs