If text or label contains syntax error, it sometimes breaks the resolution of macros in text/label. For example, if text is {h1:} {h1:trap.last()}, the valid macros is not resolved. If the sequence is opposite {h1:trap.last()} {h1:}, the result is correct . Putting the erroneous macros between two valid macros {h1:trap.last()} {h1:} {h1:trap.last()} also makes no problem.

Steps to reproduce:
1) create a map, add to icons and link them together.
2) type a text "{h1:} {h1:trap.last()}" in the label field (replace host name and item to your own).
3) Observe that the valid macros is not resolved (make sure that "Expand macros" is enabled).

Expected: Valid macros should be resolved, invalid macros must be considered as a simple text.

Observed it in 2.4 and 3.4. Most likely all versions between them are affected.