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When the keepTildes property is set to true, the expected behavior is for the tilde to duplicate the next character as it does in OE. This functionality is currently failing.

This behavior was identified during the execution of string concatenation tests from the preprocessor test suite. (committed in testcases/1828). These are the differences compared to OE:

--- /testcases/tests/conversion/preprocessor/support/baseline/string_concatenation.p.preproc    2026-02-23 14:30:46.424783852 +0200
+++ /testcases/cvt/tests/conversion/preprocessor/support/string_concatenation.p.keeptildes.preproc    2026-02-23 15:23:08.333224506 +0200
@@ -25,7 +25,7 @@
 MESSAGE "5. Mixed/Varied-Space:" a VIEW-AS ALERT-BOX.

 /* 6. Extreme Mixed / No Spacing (Lexer Stress) */
-a = '|'+"A"+"|"+'~nn'.
+a = '|'+"A"+"|"+'~n'.
 MESSAGE "6. Mixed/No-Space:" a VIEW-AS ALERT-BOX.

 /* 7. The Alternator (Switching delimiters with wide gaps) */
@@ -50,7 +50,7 @@
 MESSAGE "11. Format Mixed/Mixed-Space:" a VIEW-AS ALERT-BOX.

 /* 12. Format Tight Mixed (Lexer Stress) */
-a=string(9,">>>>9")+'|'+b+'~nn'.
+a=string(9,">>>>9")+'|'+b+'~n'.
 MESSAGE "12. Format Tight Mixed:" a VIEW-AS ALERT-BOX.

@@ -59,23 +59,23 @@
 /* 13. Variant: Original with Tilde and Space */
 display
    "A:" when l
-   "B"~   at 36
+   "B"~  at 36
    with frame f1 title "Test 13: Original Display".

 /* 14. Variant: Single Quotes and No-Space between string and attribute */
 display
    'A:'when l
-   'B'~  at 36
+   'B'~ at 36
    with frame f2 title "Test 14: Sngl/No-Space".

 /* 15. Variant: Wide Whitespace between String and Keyword */
 display
    "A:"       when l
-   'B'~        at 36
+   'B'~       at 36
    with frame f3 title "Test 15: Wide-Space Display".

 /* 16. Variant: The Chaos Display (Tilde touching the attribute) */
 display
    "A:"  when l
-   'B'~aat 36
+   'B'~at 36
    with frame f4 title "Test 16: Chaos Spacing".