Having a serious issue with superdevmode and /tmp/gwt-* corruption?

I have a gradle/eclipse project that when I remove /tmp/gwt-*, do a gradle clean build farmrun, then do a gradle gwts, everything works as expected, and I can make "one set of changes", run sdm=>recompile link, everything still works, make "a second set of changes", run sdm=>recompile link, then everything stops working in the browser with errors like at the bottom of this message.

My build.gradle file: https://github.com/muksihs/VerifiedNsfwBrowser/blob/master/build.gradle

What about my configuration could be causing this? I have only experienced issues with needing to purge /tmp/gwt-* occasionally. Never before after every single SDM build.

This happens in both Firefox and Chrome.

Using GWT 2.8.2

Gradle 4.8

===

GlobalAsyncEventBus.java:28Event: ShowLoading
2018-06-16 01:28:36.436 AppController.java:224AT_g$ {stackTrace_1_g$: null, writetableStackTrace_1_g$: true, backingJsObject_1_g$: ReferenceError: nch_g$ is not defined
    at KTg_g$.WTg_g$ [as tryLogin_0_g$] (VerifiedNsfwBrowser-0…, detailMessage_0_g$: "ReferenceError: nch_g$ is not defined", description_1_g$: ""…}
2018-06-16 01:28:36.487 ConsoleLogger.java:33Exception caught: (ReferenceError) : vch_g$ is not defined
2018-06-16 01:28:36.491 ConsoleLogger.java:55Exception: com.google.web.bindery.event.shared.UmbrellaException: Exception caught: (ReferenceError) : vch_g$ is not defined
2018-06-16 01:28:36.492 ConsoleLogger.java:33Error: com.google.web.bindery.event.shared.UmbrellaException: Exception caught: (ReferenceError) : vch_g$ is not defined
    at mAc_g$.Yl_g$ [as createError_0_g$] (Throwable.java:120)
    at mAc_g$.gm_g$ [as initializeBackingError_0_g$] (Throwable.java:112)
    at mAc_g$.Sl_g$ (Throwable.java:73)
    at mAc_g$.wm_g$ (Exception.java:33)
    at mAc_g$.Em_g$ (RuntimeException.java:33)
    at mAc_g$ (UmbrellaException.java:65)
    at T_g_g$.yzc_g$ [as doFire_0_g$] (SimpleEventBus.java:203)
    at T_g_g$.Ezc_g$ [as fireEvent_1_g$] (SimpleEventBus.java:88)
    at T_g_g$.jZg_g$ [as lambda$0_53_g$] (AsyncEventBus.java:26)
    at rZg_g$.sZg_g$ [as run_5_g$] (AsyncEventBus.java:26)
    at nZg_g$.oZg_g$ [as run_5_g$] (AsyncEventBus.java:12)
    at nZg_g$._u_g$ [as fire_0_g$] (Timer.java:135)
    at Timer.java:139
    at p$_g$ (Impl.java:309)
    at s$_g$ (Impl.java:361)
    at Impl.java:78
2018-06-16 01:28:36.492 ConsoleLogger.java:55Caused by: com.google.gwt.core.client.JavaScriptException: (ReferenceError) : vch_g$ is not defined
2018-06-16 01:28:36.511 GlobalAsyncEventBus.java:28Event: AppVersion
2018-06-16 01:28:36.942 GlobalAsyncEventBus.java:28 Event: TryLogin

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