The bug
When I light an 10x14 (length x height) nether portal, and then break it on creative, the light still remains after breaking.
How to reproduce
Make a 10x14 nether portal frame
Ignite it
Break it
Look at the remaining light after destruction
Related issues
is duplicated by
relates to
Attachments
Comments

Confirmed.
Confirmed for 1.7.5, 1.7.9 and 14w17a
Confirmed for 14w18b
Confirmed for 14w19a.
Confirmed for 14w25b.

Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Still affects 1.8.1 PR3. Updating.
Affects 1.9 (previously confirmed) as well as 1.10. I'm beginning testing on various portal sizes to see which are affected
Also present in 10x11 portals, with nothing at 10x10 or below.
Confirmed for 1.13.1.
This looks like related to chunk borders.
[media]

Seems to be fixed in 1.16 Pre-release 6.

Indeed can no longer reproduce in 1.16-pre6.
Can confirm for RC-2
[media]
Can confirm in 20w51a.
Can confirm in 21w03a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 21w07a. Video attached.

Can confirm in 1.17.1 Release Candidate 1.

Can confirm in 1.17.1 Release Candidate 2.
Can confirm in 1.18.1.
Can confirm in 1.18.2 and 22w12a.
Can confirm in 1.19.
Can confirm in 1.19.2.

Can confirm in 1.19.3

Looks fixed to me in 23w17a. Someone please double check.

Can confirm fixed in 23w17a.