Qt 6.6.2 WASM New Bugs

Hi, 

  it seems keyboard always poping out fixed on this version but there's a new bugs found and might be a blocker , i noted 2 as of today Mar 11 , 2024 

1. headers from QML XMlHttpRequest is not reflected or it is not really sent to the server per checking earlier this morning GMT+8 time , my existing application doesn't send the custom header sent  from httprequest
2. there's a weird bug related on setRequestHeader "Failed to execute 'setRequestHeader' on 'XMLHttpRequest': String contains non ISO-8859-1 code point. '   , once that error show it blocks the network connection . this is working on 6.6.1 , but not on 6.6.2 , so i believe this is not related to my code . 

Per testing ,  same code on both 6.6.1 and 6.6.2 , 6.6.1 doesn't have this issue , 

Edit: 

 Additonal info for item number 2, 

 1. it seems that on Single threaded it is always a blocker but using multithreaded it works when theres only 1 network request per page , but when there's 2 connection running at the same time , that error appears .  (POST connection)