When you use bangs along with a suggested search option it doesn't use the suggested search but, instead, it uses what your original partial search was. For example, I started typing !m restaur and selected the search suggestion !m restaurants near me but it only did restaur in Kagi maps. This makes suggestions entirely unusable with bangs and takes more effort to do searches.
When typing !m restaur and selecting the search suggestion !m restaurants near me it should search Kagi Maps with the term restaurants near me
This happens with other types of bangs as well