add new LTREE limitations

Author: taroface

src/current/_includes/v25.4/known-limitations/ltree-limitations.md

@@ -0,0 +1,2 @@
+- The `ltree2text` function produces incorrect results by wrapping the output in single quotes. For example, `ltree2text('foo.bar.baz'::LTREE)` returns `'foo.bar.baz'` instead of `foo.bar.baz`. [#156479](https://github.com/cockroachdb/cockroach/issues/156479)
+- The `LTREE` `<@` operator produces incorrect results when using an index. The optimizer creates an incorrect index constraint span for `LTREE` `<@` queries. [#156478](https://github.com/cockroachdb/cockroach/issues/156478)

src/current/v25.4/known-limitations.md

@@ -33,6 +33,10 @@ This section describes newly identified limitations in CockroachDB {{ page.versi
 
 - When using the `infer_rbr_region_col_using_constraint` option, inserting rows with `DEFAULT` for the region column uses the database's primary region instead of inferring the region from the parent table via foreign-key constraint. [#150783](https://github.com/cockroachdb/cockroach/issues/150783)
 
+### `LTREE` data type
+
+{% include {{ page.version.version }}/known-limitations/ltree-limitations.md %}
+
 ## Limitations from {{ previous_version }} and earlier
 
 This section describes limitations from previous CockroachDB versions that still impact {{ page.version.version }}.