[MCPE-180790] Beds and respawn anchors can respawn you on magma blocks that have carpets or trapdoors placed above them

Summary:
Beds and respawn anchors avoid respawning you onto dangerous blocks, including magma blocks. However, this does not apply, if there are carpets or trapdoors placed above them.

Steps to reproduce:

Set your spawnpoint using a bed or respawn anchor
```
/gamerule doImmediateRespawn true
```
```
/kill
```
Replace the block you are standing on with a magma block
```
/kill
```
Place a carpet or trapdoor on top of the magma block.
```
/kill
```

Observed results:
You respawned on top the carpet or trapdoor despite it being on magma block, meaning you will take damage.

Expected results:
The game should avoid respawning you on carpets and trapdoors that are placed on top of magma blocks.

Video:
0421 (1)(1).mp4