Variable Refresh Options problem

Hi,

After the upgrade to the version 7.1 at the version 7.4, One problem appear now when i have the option refresh “on dashboard load” my variable is not working but if I put “On time range change” it’s working again but I don’t use some refresh time option on my dashboard. Do you have any idea why i have this ?

More information : I use as a data source elasticsearch and to create my variable i use a query without regex