No more bugs

[theKashey]

Fixes 2 bugs
Improves one case (typeScript)
Adds one case (SSR)

@neoziro, I could not reproduce #854 - is it fine for me.

[joshjg]

Fixes the error I was seeing, but the end result (for me) is the same - the async child does not update

[codecov-io]

Codecov Report

Merging #857 into next will increase coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             next     #857      +/-   ##
==========================================
+ Coverage   86.86%   86.97%   +0.11%     
==========================================
  Files          30       30              
  Lines         609      622      +13     
  Branches      145      147       +2     
==========================================
+ Hits          529      541      +12     
  Misses         65       65              
- Partials       15       16       +1

Impacted Files	Coverage Δ
src/reconciler/index.js	100% <ø> (ø)	⬆️
src/proxy/createClassProxy.js	98.88% <100%> (+0.06%)	⬆️
src/proxy/constants.js	100% <100%> (ø)	⬆️
src/reconciler/hotReplacementRender.js	84.61% <100%> (-0.6%)	⬇️
src/reconciler/proxyAdapter.js	100% <100%> (ø)	⬆️
src/global/generation.js	100% <100%> (ø)	⬆️

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