Dynamic silently refuses to load over-long salts, but would ideally warn

I found a bug if I try to use a dynamic function with salt bigger than 32 character.

john -test -format:"dynamic=sha512($u.$p.$s)"

echo wordlist.txt >
password

echo > test.in
User1:145605ea09b770ffae598cdb1a1828dc6c66801c19716bbd59f64bfbb2a06e13ad72fb4896d6b180e1c297fd49680014fac80616f56e20d73f9350f150ff6a1f$NormalSalt
User2:c8620f4f0001dc11e61c134f541fd485cd875d77ab8c3f6112f1d821c2fea36018b32c6db96490cd321d4361b299d79f1cda27d7d2ad40e15d4437bca2e9acd2$SaltWithLimitOf32characterWorkss
Unbreakable:d8628ba8d3b35c21f5801216545bb232ff0280d04eb6b7b552217b1da117762507f457f5629216d0a6576efefb4df57de7a1acd8f28b6fc2f017a2d2aa991459$SaltWithMoreThan32characterWillNotWork

So, if I run the program:
john --format:"dynamic=sha512($u.$p.$s)" --wordlist=wordlist.txt test.in
Only found two:

password         (User1)
password         (User2)

To solve this, I can just change the order of the user and salt

john -test -format:"dynamic=sha512($s.$p.$u)"

echo > solved.in
NormalSalt:145605ea09b770ffae598cdb1a1828dc6c66801c19716bbd59f64bfbb2a06e13ad72fb4896d6b180e1c297fd49680014fac80616f56e20d73f9350f150ff6a1f$User1
SaltWithLimitOf32characterWorkss:c8620f4f0001dc11e61c134f541fd485cd875d77ab8c3f6112f1d821c2fea36018b32c6db96490cd321d4361b299d79f1cda27d7d2ad40e15d4437bca2e9acd2$User2
SaltWithMoreThan32characterWillNotWork:d8628ba8d3b35c21f5801216545bb232ff0280d04eb6b7b552217b1da117762507f457f5629216d0a6576efefb4df57de7a1acd8f28b6fc2f017a2d2aa991459$Unbreakable

john --format:"dynamic=sha512($s.$p.$u)" --wordlist=wordlist.txt solved.in
Now every password is found:

password         (NormalSalt)
password         (SaltWithLimitOf32characterWorkss)
password         (SaltWithMoreThan32characterWillNotWork)

This is a VERY difficult bug to find! And there are some problems with it.

I have a bad salt (with new line). So I input it in hex. But...

• Because the salt is bigger than 32, I can't input it.
• If I use the hex salt as User, the John don't accept.

So, how can I solve it? How can I input the User as hex? Only after the bug is solved?

This is my version (the last):

John the Ripper 1.9.0-jumbo-1 OMP [cygwin 64-bit x86_64 AVX2 AC]
Copyright (c) 1996-2019 by Solar Designer and others

Start by reproducing the dynamic=sha512($u.$p.$s) commands with the supplied test.in data, then compare them with the reordered $s.$p.$u case. Trace the dynamic-format handling of salts longer than 32 characters and hex input; done should include an explicit warning instead of silently refusing the over-long salt and clarify how the reported input can be handled.