Bug in "Liabilities Barchart" report (since 2.6.19)

[Di Mang]

Hello,

I have a problem with the "Liabilities Chart", "Asset Chart" and "Net Worth
Barchart" reports since I switched to GnuCash 2.6.19 (on Ubuntu 17.10). I
have this problem with unstable 2.7.3 too (built from source). With GnuCash
2.6.17 the reports worked as expected.

These reports display the accumulated amounts, but only based on the
transactions from the selected period. The transactions before the start
time are ignored. See example in the appendix (as image and GnuCash file).

​I tried to find the error. Unfortunately, I do not know where to start.​
Can someone please look at it. With the example from the attachment it
should be easy. Thanks in advance!

​DM​
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