Salesforce Embed Throwing Error from Power BI JS Library

We have had an embedded Power BI report Lightning Web Component running for a few months, so far with just one report being displayed. Recently we tried to add another report but it appears that this report is causing an error to be thrown from within the PowerBI javascript library that we have as a static resource in the Salesforce org.

The embed token is being retrieved, and the report begins to render, but then throws multiple instances of the same aura component error. It appears that these graphics may be causing the isssue.

Each of these components throw its own error, showing as an aura error modal. From that modal:

Uncaught Error in $A.getCallback() [a.indexOf is not a function]
throws at https://mycompany--test.lightning.force.com/auraFW/javascript/2yRFfs4WfGnFrNGn9C_dGg/aura_prod.js:129:15. Caused by: Error in $A.getCallback() [a.indexOf is not a function]
{anonymous}()@https://mycompany--test.lightning.force.com/auraFW/javascript/2yRFfs4WfGnFrNGn9C_dGg/aura_prod.js:944:191
b()@https://mycompany--test.lightning.force.com/auraFW/javascript/2yRFfs4WfGnFrNGn9C_dGg/aura_prod.js:946:72
$.C.ta()@https://mycompany--test.lightning.force.com/auraFW/javascript/2yRFfs4WfGnFrNGn9C_dGg/aura_prod.js:944:311
a()@https://mycompany--test.lightning.force.com/auraFW/javascript/2yRFfs4WfGnFrNGn9C_dGg/aura_prod.js:1025:196
{anonymous}()@https://mycompany--test.lightning.force.com/auraFW/javascript/2yRFfs4WfGnFrNGn9C_dGg/aura_prod.js:1025:389
Proxy.<anonymous>()@https://mycompany--test.lightning.force.com/auraFW/javascript/2yRFfs4WfGnFrNGn9C_dGg/aura_prod.js:100:90760
Object.raiseCustomEvent()@https://mycompany--test--c.visualforce.com/resource/1650479333000/PBIJS/PBIJS/PBIJS.js:1389:19
Service.handleEvent()@https://mycompany--test--c.visualforce.com/resource/1650479333000/PBIJS/PBIJS/PBIJS.js:619:21
eval()@https://mycompany--test--c.visualforce.com/resource/1650479333000/PBIJS/PBIJS/PBIJS.js:146:21
Object.routeRecognizerHandler()@https://mycompany--test--c.visualforce.com/resource/1650479333000/PBIJS/PBIJS/PBIJS.js:9777:46

We are using v2.11.0 of the PowerBI js library.

Code snippets, including line numbers from the above stack trace:

Router.prototype.registerHandler = function (
                    routeRecognizer,
                    method,
                    url,
                    handler
                  ) {
                    var routeRecognizerHandler = function (request) {
                      var response = new Response();
9777                    return Promise.resolve(handler(request, response)).then(
                        function (x) {
                          return response;
                        }
                      );
                    };

this.router.post("/reports/:uniqueId/events/:eventName", function (
              req,
              res
            ) {
              var event = {
                type: "report",
                id: req.params.uniqueId,
                name: req.params.eventName,
                value: req.body,
              };
146           _this.handleEvent(event);
            });

if (embed) {
              var value = event.value;
              if (event.name === "pageChanged") {
                var pageKey = "newPage";
                var page = value[pageKey];
                if (!page) {
                  throw new Error(
                    "Page model not found at 'event.value." + pageKey + "'."
                  );
                }
                value[pageKey] = new page_1.Page(
                  embed,
                  page.name,
                  page.displayName,
                  true /* isActive */
                );
              }
619           utils.raiseCustomEvent(embed.element, event.name, value);
            }
          };

function raiseCustomEvent(element, eventName, eventData) {
          var customEvent;
          if (typeof CustomEvent === "function") {
            customEvent = new CustomEvent(eventName, {
              detail: eventData,
              bubbles: true,
              cancelable: true,
            });
          } else {
            customEvent = document.createEvent("CustomEvent");
            customEvent.initCustomEvent(eventName, true, true, eventData);
          }
1389       element.dispatchEvent(customEvent);
        }

 After that, the stack trace leads into the aura js source, which is minified.