Cannot add the word "Javascript" to custom dictionary with a capital J

[Riley]

hunspell always marks the word Javascript as incorrect even when added in a custom dictionary.

Minimal example:

words.txt:

Javascript

text.txt:

Javascript cannot be marked as correct.

Command: hunspell -l -d en_US -p words.txt test.txt

Output:

Javascript

However, if words.txt contains javascript with lowercase j, it's all good. This however doesn't happen for other words, for example when I add my username:

words.txt

Javascript
Staticfox

text.txt

Javascript cannot be marked as correct.
Staticfox on the other hand.

Output:

Javascript

Version: International Ispell Version 3.2.06 (but really Hunspell 1.7.0)
OS: Fedora 37
Packages:

hunspell.x86_64                                  1.7.0-21.fc37
hunspell-en-US.noarch                            0.20140811.1-23.fc37

[Caolán McNamara]

This is probably due to the presence of "JavaScript/M" in /usr/share/hunspell/en_US.dic