Reproduction of the issue with SystemJS dynamic import.
SystemJS.import is used to load two almost-identical modules that export a function. Only the first one was loaded.
index.html:
<head>
...
<script src="https://cdn.jsdelivr.net/npm/systemjs/dist/system.js"></script>
<script>
System.import("/module1.js").then(m => (document.getElementById("mod1").innerText = m.default()));
System.import("/module2.js").then(m => (document.getElementById("mod2").innerText = m.default()));
</script>
</head>
<body>
<div id="mod1"></div>
<div id="mod2"></div>
</body>Expected output:
MODULE 1
MODULE 2
Actual:
MODULE1
The second module did not get loaded, although no error was thrown by SystemJS.