The spo list command logs the complete filter in the telemetry rather than just logging if it's been set or not. The logged value should be a boolean rather than a string.

https://github.com/SharePoint/office365-cli/blob/7cc3fd461b175caa96acddbb63efa399fdd8affb/src/o365/spo/commands/site/site-list.ts#L39