Frontend: Template section doesn't show results correctly

[snakuzzo]

Checklist

• [x] I have updated to the latest available Home Assistant version.
• [x] I have cleared the cache of my browser.
• [x] I have tried a different browser to see if it is related to my browser.

The problem

On template testing I noticed a stange behaviour. If I put a correct code in upper position (first 5 rows) nothing is showed

Expected behavior

If I put correct code in every position I expect to view something

Steps to reproduce

Clear template code and write something in first 5 rows

Environment

• Home Assistant release with the issue: 0.112.0
• Last working Home Assistant release (if known): 0.111.4
• Browser and browser version: Chrome Version 83.0.4103.116 (Official Build) (64-bit) and Firefox 77.0.1 (64-bit)
• Operating system client: Ubuntu 20.x
• Operating system server: Raspbian Buster

State of relevant entities

Problem-relevant configuration

Javascript errors shown in your browser console/inspector

No javascript errors

Additional information

[Scialla]

Same for me. It seems that first 4 rows are under header

[cobradodo]

It seems that first 4 rows are under header...

[maxcanna]

both panes are under the header

[Guyohms]

see #6297