I know this is an old post, but I came across this issue myself. I put together a quick script to automate the session clear after a failover: https://github.com/jonnymacbean/palo-ha-meraki-fix Hopefully it's of use to somebody.
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LITHIUM.InformationBox({"updateFeedbackEvent":"LITHIUM:updateAjaxFeedback","componentSelector":"#informationbox_8640467d3cdbc_0","feedbackSelector":".InfoMessage"});
LITHIUM.InformationBox({"updateFeedbackEvent":"LITHIUM:updateAjaxFeedback","componentSelector":"#informationbox_8640467d3cdbc_1","feedbackSelector":".InfoMessage"});
LITHIUM.InformationBox({"updateFeedbackEvent":"LITHIUM:updateAjaxFeedback","componentSelector":"#informationbox_8640467d3cdbc_2","feedbackSelector":".InfoMessage"});
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