Can't save 2 persistences (blockly)

[SnouF]

Steps to Reproduce

Write blockly

var timeSeries = new items.TimeSeries('REPLACE');
[[time.ZonedDateTime.now().plusHours(1), '1'], [time.ZonedDateTime.now().plusHours(2), '2'], [time.ZonedDateTime.now().plusHours(3), '3']].forEach(s => timeSeries.add(s[0], s[1]));
items.getItem('testPersist0').persistence.persist(timeSeries, 'inmemory');
var timeSeries2 = new items.TimeSeries('REPLACE');
[[time.ZonedDateTime.now().plusHours(1), '6'], [time.ZonedDateTime.now().plusHours(2), '5'], [time.ZonedDateTime.now().plusHours(3), '4']].forEach(s => timeSeries2.add(s[0], s[1]));
items.getItem('testPersist1').persistence.persist(timeSeries, 'inmemory');

Create chart

config:
  label: testPersist
  future: 0.75
slots:
  grid:
    - component: oh-chart-grid
      config: {}
  xAxis:
    - component: oh-time-axis
      config:
        gridIndex: 0
  yAxis:
    - component: oh-value-axis
      config:
        gridIndex: 0
  series:
    - component: oh-time-series
      config:
        name: persist0
        gridIndex: 0
        xAxisIndex: 0
        yAxisIndex: 0
        type: line
        item: testPersist0
        service: inmemory
    - component: oh-time-series
      config:
        name: persist1
        gridIndex: 0
        xAxisIndex: 0
        yAxisIndex: 0
        type: line
        item: testPersist1
        service: inmemory
  tooltip:
    - component: oh-chart-tooltip
      config:
        show: true

Same data for both persistence values. The first is correct, the second is incorrect.

Environment

version: 5.1.0
buildString: Release Build