1. Open new Unity project
2. Open Search window (Ctrl+K)
3. In Search window, Toggle Query Builder Mode (F1)
4. Add the "in Project" Search Area and a new Query Block (Tab) -> Operators -> AND
5. Toggle Query Builder Mode (F1) twice
6. Observe the search query

Expected result: The "AND" Query Block remains
Actual result: The "AND" Query Block is hidden

Reproducible with: 2022.1.0b4, 2022.2.0a2
Could not test with: 2019.4.34f1, 2020.3.26f1, 2021.2.8f1 (Codeless Search Query functionality not available)

Note:
When removing the right-hand operator of a complete "OR" Operator query, then toggling Query Builder mode on and off, the "OR" Operator is no longer a Query Block, but simple text