Bug: Double-clicking any navigation tab causes a React error in small projects and complete browser crashes in larger projects

Bug Description

Bug description

Double clicking any tab in PostHog causes the browser to crash, or presents a React error.

    at T1 (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:13:33989)
    at yC (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:11:24883)
    at https://app-static-prod.posthog.com/static/chunk-3NDNDLVS.js:58:46308
    at t5 (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:13:24398)
    at p0 (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:13:42664)
    at DC (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:13:41470)
    at hn (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:13:40490)
    at H7 (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:13:37069)
    at rn (https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:11:3274)
    at https://app-static-prod.posthog.com/static/chunk-FF7YSX62.js:13:34421

How to reproduce

1. Doubleclick any navigation tab in PostHog

Additional context

From: https://posthoghelp.zendesk.com/agent/tickets/39048 (moved to PostHog: https://us.posthog.com/project/2/support/tickets/40814) and https://posthog.slack.com/archives/C06K4Q1AZMW/p1759278384035909

Debug info

Kind: bug

Target area: feature_flags

Report event: http://go/ticketByUUID/ae810723-e889-4658-a3bd-e47c273bb67c

Session: https://us.posthog.com/project/sTMFPsFhdP1Ssg/replay/0199a0bb-1eca-7422-9524-481dbc3d033f?t=156

Exceptions: https://us.posthog.com/project/2/error_tracking?filterGroup=%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22key%22%3A%22%24session_id%22%2C%22value%22%3A%5B%220199a0bb-1eca-7422-9524-481dbc3d033f%22%5D%2C%22operator%22%3A%22exact%22%2C%22type%22%3A%22event%22%7D%2C%7B%22type%22%3A%22hogql%22%2C%22key%22%3A%22uuid%20%3D%20'0199a0bd-84f7-7d11-b9d2-ad846e3e5338'%22%2C%22value%22%3Anull%7D%5D%7D%5D%7D

Location: https://us.posthog.com/project/65758/feature_flags/201478#panel=settings%3Abug%3Afeature_flags%3Amedium%3Atrue

Persons-on-events mode for project: person_id_override_properties_joined

Start by reproducing the double-click navigation-tab crash in the feature_flags area, then inspect the React error and the linked session replay and error-tracking reports. The issue names no source files or tests, so trace the navigation path from the reproduced failure. Done means double-clicking any navigation tab no longer produces a React error or crashes the browser.