DELETE request's preflight fails on Firefox for Quarkus - reactjs

Question

I'm getting a very strange error which I'm having a very hard time understanding why it's occurring.
Setup
I have a Quarkus backend which serves the following endpoints:
#Path("/rest/manager")
#ApplicationScoped
public class ManagerController {
...
#GET
#Path("/")
public Response getManagerList() {
...
}
#POST
#Path("/")
public Response createManager(#Valid ManagerView managerView) {
...
}
#GET
#Path("/{userId}")
public Response getManager(#Parameter(required = true) #PathParam("userId") String userId) {
...
}
#DELETE
#Path("/{userId}")
public Response deleteManager(#Parameter(required = true) #PathParam("userId") String userId) {
...
}
#PUT
#Path("/{userId}")
public Response updateManager(#PathParam("userId") String userId, #Valid ManagerView managerView) {
...
}
}
Quarkus application.properties looks like this:
quarkus.http.cors=true
quarkus.http.cors.origins=http://localhost:3000
quarkus.http.cors.methods=GET,POST,PUT,DELETE,OPTIONS
My frontend runs on localhost:3000 and backend on localhost:8080.
Frontend is in React, and i'm using axios to make the call like this:
.post<ManagerView>(`/manager`, managerToManagerView(data.manager), {
headers: {
Authorization: `Bearer ${data.accessToken}`,
'Content-Type': 'application/json',
},
})
...
.delete<boolean>(`/manager/${userId}`, {
headers: {
Authorization: `Bearer ${data.accessToken}`,
},
})
The Error
In Firefox, I get the following error when i make a Delete request.
XHR OPTIONS http://localhost:8080/rest/manager/auth0|63de17288141500bc6ac65e0
CORS Missing Allow Origin
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8080/rest/manager/auth0|63de17288141500bc6ac65e0. (Reason: CORS header ‘Access-Control-Allow-Origin’ missing). Status code: 400.
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://localhost:8080/rest/manager/auth0|63de17288141500bc6ac65e0. (Reason: CORS request did not succeed). Status code: (null).
Here's a screenshot from the Browser's devtools:
As you can see, just before the DELETE request, there is a POST request and the preflight for that is successful.
This is the details of the preflight which fails (the one before DELETE):
Also for comparison, here is the preflight request which doesn't fail (The one before POST)
This error only happens on DELETE or PUT. Other methods (POST and GET) are working fine.
This error only happens on Firefox, not on Chrome or Edge
Another interesting detail might be that on Chrome it doesn't work if I don't supply the Authorization header
I have tried various CORS settings for Quarkus however nothing works.