Downgrading the project to 2019.3

Packages/manifest.json

     "com.unity.2d.tilemap": "1.0.0",
     "com.unity.ads": "3.3.1",
     "com.unity.analytics": "3.3.5",
-    "com.unity.collab-proxy": "1.3.6",
     "com.unity.ext.nunit": "1.0.0",
     "com.unity.ide.rider": "1.2.1",
     "com.unity.ide.visualstudio": "2.0.0",
     "com.unity.render-pipelines.high-definition": "7.2.0",
     "com.unity.render-pipelines.high-definition-config": "file:../LocalPackages/com.unity.render-pipelines.high-definition-config",
     "com.unity.test-framework": "1.1.11",
-    "com.unity.timeline": "1.2.6",
+    "com.unity.timeline": "1.2.10",
     "com.unity.xr.legacyinputhelpers": "2.0.6",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.androidjni": "1.0.0",

ProjectSettings/HDRPProjectSettings.asset

   m_DefaultDXRScenePrefabSaved: {fileID: 0}
   m_ProjectSettingFolderPath: HDRPDefaultResources
   m_WizardPopupAtStart: 0
+  m_WizardPopupAlreadyShownOnce: 0
+  m_WizardNeedRestartAfterChangingToDX12: 0
+  m_WizardNeedToRunFixAllAgainAfterDomainReload: 0
   m_LastMaterialVersion: 2

ProjectSettings/ProjectVersion.txt

-m_EditorVersion: 2020.1.0a23
-m_EditorVersionWithRevision: 2020.1.0a23 (242010beed50)
+m_EditorVersion: 2019.3.1f1
+m_EditorVersionWithRevision: 2019.3.1f1 (20b253a5e376)