Unable to close select with Angular 7 about ng2-timezone-selector

[PandaTeemo]

verify timezone selector actually IS using newest select2:

check select2 version uses ng2-timezone-selector by looking at
node_modules/ng2-timezone-selector/node_modules/select2/package.json

for me, the ^ prefix didnt work to use 4.0.7-rc.0 so I had to call following manually (in a makefile)
cd node_modules/ng2-timezone-selector;
npm install select2@latest --save
after everything was already updated. to force the latest version

also the official 4.0.7 is already available, but not may yet not be reflected in all the repos. So expect everything to just work soon :)

[PandaTeemo]

this is caused by dependency: select2, the latest version fixes this

[dodomui]

I had upgrade select2 version to 4.0.7-rc.0
But the problem still the same, the select dropdown close and open automatically after I click on the select dropdown.