Depending on the way your script is recording max_price, it isn’t really a meta_key/meta_value on postmeta table.
Did you try changin max_price clause to something like this?
['max_price'] => [
'relation' => 'OR',
[
'key' => 'max_price',
'value' => 11,
'compare' => '<=',
],
[
'key' => 'max_price',
'compare' => 'NOT EXISTS',
],
],
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