Data validation “Other” generates invalid formula when selecting range (Desktop 9.3.1.8)

Created this with the AI bot but seemed right ot me except a few edits**

Product / Version:**
ONLYOFFICE Desktop Editors, Community version 9.3.1.8 (x64 MSI) on Windows 11

Description:
When using Data validation with type “Other” and selecting a range using the picker, the editor generates a formula that is not a valid logical expression, so the rule is effectively invalid.

Steps to reproduce:

  1. Open a spreadsheet in Desktop Editors.
  2. Select any cell (e.g. A1).
  3. Go to Data → Data validation.
  4. Set Type to Other.
  5. Click the range selector and select cells E10:F17.
  6. Confirm the dialog.

Actual result:

  • The condition field is filled with =$E$10:$F$17.
  • This is not a valid logical (TRUE/FALSE) expression for a custom validation rule.
  • The UI makes it look like this is a valid rule, but it doesn’t work as expected.

Expected result:

  • Either:
    • It should tell me to use list not “other”
    • “Other” should require/enforce a logical formula and warn if the user enters only a bare range; or ( or be called logic formula or similar)
    • The range picker in “Other” should be clearly indicated as “Insert reference into custom formula”; or
    • The product should help convert the selection into a valid expression or guide the user (e.g. =COUNTIF($E$10:$F$17, A1) > 0).

Additional info:

  • I initially used “Other” because I could select a range and expected behavior similar to a “List” rule
  • I later found that List is the correct type for “values from a range”, but the “Other” behavior is confusing to a new user like me