Casting to parent Buffer

[eyalkoren]

Fixing #400

[codecov-io]

Codecov Report

Merging #401 into master will decrease coverage by 0.47%.
The diff coverage is 0%.

@@ Coverage Diff @@ ## master #401 +/- ## ============================================ - Coverage 72.49% 72.01% -0.48%  + Complexity 1325 1265 -60  ============================================ Files 141 140 -1 Lines 5213 4864 -349 Branches 554 495 -59 ============================================ - Hits 3779 3503 -276  + Misses 1210 1138 -72  + Partials 224 223 -1

Impacted Files	Coverage Δ	Complexity Δ
...java/co/elastic/apm/agent/impl/transaction/Db.java	59.45% <0%> (ø)	12 <0> (ø)	⬇️
.../agent/plugin/api/AbstractSpanInstrumentation.java	53.19% <0%> (-11.27%)	3% <0%> (-7%)
...java/co/elastic/apm/agent/bci/ElasticApmAgent.java	72.18% <0%> (-1.74%)	19% <0%> (-3%)
...astic/apm/agent/impl/transaction/TraceContext.java	92.21% <0%> (-1.06%)	56% <0%> (-44%)
...bci/bytebuddy/FailSafeDeclaredMethodsCompiler.java
...agent/plugin/api/ElasticApmApiInstrumentation.java	52% <0%> (+3.47%)	3% <0%> (-2%)	⬇️

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