I found that lightning-record-form does not work correct.
<template> <lightning-record-form record-id="anyAccountId" object-api-name="Account" layout-type="Full" mode="view" columns="2"> </lightning-record-form> </template>
if you try to edit it it will not work, component is hide. And only save and cancel buttons are shown. If click to cancel everything is hided. This issue affected CS2 sf instance but works fine in NA59.