Rise of the sanity check Exception: Part II

It is likely just me, running ./compile.sh -s with HEAD as dc1da - Merge branch 'pAffairs' into 'pregmod-master' on a Linux system produces

[ShouldBeRefreshment]src/uncategorized/BackwardsCompatibility.tw:562:   <<set _newPC.refreshmentType = $PC.refreshmentType>>
[MissingDollar2]src/utility/extendedFamilyWidgets.tw:183:               <<set _momsiblings = $slaves.filter((s) => { const sis = areSisters(s, $PC.mother); return sis == 1 || sis == 2; }),
[MissingDollar2]src/utility/extendedFamilyWidgets.tw:227:       <<set _momsiblings = $slaves.filter((s) => { const sis = areSisters(s, $activeSlave.mother); return sis == 1 || sis == 2; }),
[Duplicate words]src/003-assets/CSS/links.css:41:       border-color: #555 transparent transparent transparent;
[Duplicate words]src/003-assets/CSS/tooltip.css:57:     border-color: slategray transparent transparent transparent;
[WrongSelectorPunctuation]src/Mods/Reminder/reminder.js:78:                     r += `<div>${entry.message} <span class="${classes}">${week}</span>. ${App.UI.link("Clear", clearEntry, [entry])}</div>`;
Exception in thread "main" org.arkerthan.sanityCheck.UnknownStateException: 12
        at org.arkerthan.sanityCheck.logic.element.AngleBracketElement.getShortDescription(AngleBracketElement.java:382)
        at org.arkerthan.sanityCheck.logic.SyntaxChecker.handleChar(SyntaxChecker.java:150)
        at org.arkerthan.sanityCheck.Main.handleCharacter(Main.java:170)
        at org.arkerthan.sanityCheck.Main.handleCharacters(Main.java:143)
        at org.arkerthan.sanityCheck.Main.sanityCheck(Main.java:126)
        at org.arkerthan.sanityCheck.Main.runSanityCheckInDirectory(Main.java:81)
        at org.arkerthan.sanityCheck.Main.runSanityCheckInDirectory(Main.java:87)
        at org.arkerthan.sanityCheck.Main.main(Main.java:48)
x64 arch
Saved to bin/FC_pregmod.html.
Compilation finished.

It still occurs after applying !5967 (merged).
Rolling back a single commit to 267c55f3d Merge branch 'css' into 'pregmod-master' does not produce the error.