Bug ID 2241393: MutationObserver may not work in some cases

Last Modified: Mar 28, 2026

Affected Product(s):
BIG-IP APM(all modules)

Known Affected Versions:
17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5

Opened: Mar 12, 2026

Severity: 3-Major

Symptoms

MutationObserver may not work in some cases

Impact

Funtionality that depends on mutationObservers wont work (i.e. Promises).

Conditions

MutationObservers used in application run through portal access

Workaround

None

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips