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I checked our WS log, and while I can't find any custom checkbox fields, I suspect that they not only need the value, but need to specify the type:

&lt;customField scriptId="custrecord_s7sessions_isloggedin" internalId="2638" xsi:type="StringCustomFieldRef" xmlns="urn:core_2019_1.platform.webservices.netsuite.com"&gt;
                        &lt;value&gt;Crashed&lt;/value&gt;
                    &lt;/customField&gt;

based on this I would presume the custom field should be similar boolean: &lt;q1:isInactive&gt;false&lt;/q1:isInactive&gt;

although, obviously, as it's native, doesn't have the xsi:type attr

Looked at the logs - and he didn't try setting it as anything other than false...