Querying measures in rollup joins

**Problem**

I have two cubes from different datasources (cube1, cube2) with a many-to-one join from cube2 to cube1. I'm able to make join queries as long as I only include the dimensions from the rollup join but when I include a measure from cube cube2 the query fails with `To join across data sources use rollupJoin with Cube Store. If rollupJoin is defined, this error indicates it doesn't match the query. Please use Rollup Designer to verify it's definition. Found data sources: datasource1, default`.

Note that for cube2 I confirmed from the cube playground UI that the measure is picked up during pre-aggregation from `Query was accelerated with pre-aggregation` in the UI.

My question is whether measures are expected to work in rollup_joins and if so what am I missing?

My cubejs version is `cube:1.2.29`.

**Related Cube.js schema**
```javascript
cube(`cube1`, {
sql_table: `"DB1"."TABLE1"`,

data_source: `datasource1`,

measures: {
quartic_entry: {
sql: `QUARTIC_ENTRY`,
type: `max`,
title: `Quartic Entry Average`,
},
replicate_count: {
sql: `REPLICATE_COUNT`,
type: `sum`,
title: `Replicate Count`
}
},

dimensions: { ... },
pre_aggregations: {
t1Rollup: {
type: `rollup`,
dimensions: [...],
measures: [QUARTIC_ENTRY, REPLICATE_COUNT]
},
indexes: {...}
}
}
```

```javascript
cube(`cube2`, {
sql: `SELECT * FROM table2`,
data_source: `default`,
joins: {
cube1: {
relationship: `many_to_one`,
sql: `${batchNumber} = ${cube1.x_comet_batch}`
}
},
dimensions: {...},
pre_aggregations: {
t2Rollup: {
type: `rollup`,
dimensions: [...],
indexes: [...]
},
combinedRollup: {
type: 'rollup_join',
dimensions: [...],
measures: [cube1.quartic_entry, cube1.replicate_count], // Can't query these
rollups: [cube1. cube2],
}
}
```

**Related Cube.js generated SQL**

NA