SELECT FROM multiple measurements returns values from only one measurement

## Steps to reproduce

Open CLI and type commands as shown:
```
Connected to http://localhost:8086 version 1.8.4
InfluxDB shell version: 1.8.4
> create database "sample"
> use sample
Using database sample
> insert channels,topic="foo" value=3.432
> insert boolean,topic="bar" value=true
> SELECT * FROM channels,boolean
name: channels
time topic value
---- ----- -----
1613754223159795400 "foo" 3.432
> SELECT * FROM boolean,channels
name: channels
time topic value
---- ----- -----
1613754223159795400 "foo" 3.432
> SELECT * FROM channels
name: channels
time topic value
---- ----- -----
1613754223159795400 "foo" 3.432
> SELECT * FROM boolean
name: boolean
time topic value
---- ----- -----
1613754242210800700 "bar" true
>
```

## Expected Behaviour

The first two `SELECT` statement - `SELECT * FROM channels,boolean` and `SELECT * FROM boolean,channels` - should result in both measurements - `channels` and `boolean` being shown.

## Actual Behaviour

Only the value from measurement `channels` is shown in each case.

## Environment Info

* System info: Linux 5.4.72-microsoft-standard-WSL2 x86_64
* InfluxDB version: InfluxDB v1.8.4 (git: 1.8 bc8ec4384eed25436d31045f974bf39f3310fa3c)
* Other relevant environment details: CLI run (and environment info above) from docker container (influxdb:1.8.4) invoked with the following environment variables set:
- INFLUXDB_DATA_ENGINE=tsm1
- INFLUXDB_REPORTING_DISABLED=true
- INFLUXDB_HTTP_LOG_ENABLED=true

Reproduce the issue in the CLI using the commands and two measurement orders shown in the report. Trace the query handling for multiple measurements; done means both SELECT statements return rows for channels and boolean rather than only channels.

Written by the indexing model from the issue text.